It might be related to the recent Yahoo! technique of greylisting addresses they feel are suspect. >>> "Tabariasl, Hamid" <[log in to unmask]> 11/20/2006 3:52 PM >>> 147.226.7.236 does not like receipient. Remote host said: 550 5.7.1 Unable to relay for [log in to unmask] Giving up on 147.226.7.236